If I have to take a guess, they were looking for his private keys for the 1 million bitcoins. How many agents are going to be arrested for stealing coins after this raid? It was to be expected and we might be seeing some tax charges being filed, if they find anything.
Let's say for one moment, Wright is Satoshi, would it not be more suitable to protect him? He will after all be the greatest inventor in this century. He will be the financial Einstein of the world. Strange how governments attack people like these.